[R] library sets: A & EMPTY does not work; gset_intersection(A,EMPTY) works
Czerminski, Ryszard
Ryszard.Czerminski at astrazeneca.com
Tue Apr 6 19:37:51 CEST 2010
Hi Peter,
This looks like another one: "gset_is_equal(X,X)" and "X == X" evaluate to FALSE ?
> uv <- c('a', 'b', 'c'); s <- gset(uv, runif(length(uv)))
> s
{"a" [0.0811552], "b" [0.3552998], "c" [0.996772]}
> gset_is_equal(s, s)
[1] FALSE
> s == s
[1] FALSE
> class(s)
[1] "gset" "cset"
>
Best regards,
Ryszard
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-----Original Message-----
From: Peter Ehlers [mailto:ehlers at ucalgary.ca]
Sent: Wednesday, March 31, 2010 2:03 PM
To: Czerminski, Ryszard
Cc: R-help at r-project.org; David Meyer
Subject: Re: [R] library sets: A & EMPTY does not work; gset_intersection(A,EMPTY) works
Ryszard,
You've made me take a closer look and now I do think that
you've found a bug.
After a quick look at the package vignette, I see that the
authors have indeed overloaded "&" and so it should work for
your example. The problem seems to be the order of the class
attribute which is used to call the relevant 'Ops' function:
class(A)
#[1] "gset" "cset"
class(B)
#[1] "gset" "cset"
class(E <- A - A)
#[1] "set" "gset" "cset"
If you re-order the class vector, function Ops.gset will be called
to handle A and E:
class(E) <- class(E)[c(2,3,1)]
A & E
#{}
I've cc'd David Meyer.
-Peter Ehlers
On 2010-03-31 10:11, Czerminski, Ryszard wrote:
> It seems that "A& B" works the same way as "gset_intersection(A,B)"
> as long as A and B are not empty...
> see below:
>
> fuzzy_logic("Yager", p=2)
> support<- universe<- c('a','b','c','d')
> A<- gset(support=support, memberships=c(0.2, 0.2, 0.9, 0),
> universe=universe)
> B<- gset(support=support, memberships=c(0.211, 0.222, 0.999, 0),
> universe=universe)
> A
> B
> A& B
> gset_intersection(A,B)
> E<- A - A
> A& E
> gset_intersection(A,E)
>
>> fuzzy_logic("Yager", p=2)
>> support<- universe<- c('a','b','c','d')
>> A<- gset(support=support, memberships=c(0.2, 0.2, 0.9, 0),
> universe=universe)
>> B<- gset(support=support, memberships=c(0.211, 0.222, 0.999, 0),
> universe=universe)
>> A
> {"a" [0.2], "b" [0.2], "c" [0.9]}
>> B
> {"a" [0.211], "b" [0.222], "c" [0.999]}
>> A& B
> {"c" [0.899995]}
>> gset_intersection(A,B)
> {"c" [0.899995]}
>> E<- A - A
>> A& E
> Error in A& E :
> operations are possible only for numeric or logical types
> In addition: Warning message:
> Incompatible methods ("Ops.gset", "Ops.set") for "&"
>> gset_intersection(A,E)
> {}
>
>
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>
> -----Original Message-----
> From: Peter Ehlers [mailto:ehlers at ucalgary.ca]
> Sent: Wednesday, March 31, 2010 11:43 AM
> To: Czerminski, Ryszard
> Cc: R-help at r-project.org
> Subject: Re: [R] library sets: A& EMPTY does not work;
> gset_intersection(A,EMPTY) works
>
> On 2010-03-31 9:30, Peter Ehlers wrote:
>> Unless I'm missing something, I don't see any method
>> in pkg:sets for intersection other than gset_intersection.
>
> Whoops, a bit quick on the draw.
> There are of course also set_intersection and cset_intersection,
> but not AFAICS any method for `&`.
>
> -Peter Ehlers
>
>> So you're using the base R function `&` whose help page
>> tells you that its arguments should be vectors. Yours
>> aren't.
>>
>> -Peter Ehlers
>>
>> On 2010-03-31 8:50, Czerminski, Ryszard wrote:
>>> When using generalized sets from "sets" library
>>>
>>> A& EMPTY does not work, but gset_intersection(A,EMPTY) works: example
>>> code below
>>>
>>> Is it a bug?
>>>
>>> Best regards,
>>> Ryszard
>>>
>>> library(sets)
>>> support<- universe<- c('a','b','c','d')
>>> A<- gset(support=support, memberships=c(0.2, 0.2, 0.9, 0),
>>> universe=universe)
>>> class(A)
>>> A
>>> E<- A - A # create empty set
>>> I<- gset_intersection(A, E) #<<< this WORKS
>>> class(I); I
>>> I<- A& E #<<< this DOES NOT WORK
>>>
>>> # ---
>>>
>>>> support<- universe<- c('a','b','c','d')
>>>> A<- gset(support=support, memberships=c(0.2, 0.2, 0.9, 0),
>>> universe=universe)
>>>> class(A)
>>> [1] "gset" "cset"
>>>> A
>>> {"a" [0.2], "b" [0.2], "c" [0.9]}
>>>> E<- A - A
>>>> I<- gset_intersection(A, E) #<<< this WORKS
>>>> class(I); I
>>> [1] "set" "gset" "cset"
>>> {}
>>>> I<- A& E #<<< this DOES NOT WORK
>>> Error in A& E :
>>> operations are possible only for numeric or logical types
>>> In addition: Warning message:
>>> Incompatible methods ("Ops.gset", "Ops.set") for "&"
>>>
>>>
>>>
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>>
>
--
Peter Ehlers
University of Calgary
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